src/glog/logging.h.in: change counters' duration to thread_local

TSan warns about a race in LOG_EVERY_N macros since the
static integer counters are unsynchronized.

Using mutexes would be an overkill in this case, while
thread-local storage suffices.

src/glog/logging.h.in

@@ -897,7 +897,7 @@ PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
 #define LOG_OCCURRENCES_MOD_N LOG_EVERY_N_VARNAME(occurrences_mod_n_, __LINE__)
 
 #define SOME_KIND_OF_LOG_EVERY_N(severity, n, what_to_do) \
-  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  thread_local int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
   ++LOG_OCCURRENCES; \
   if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
   if (LOG_OCCURRENCES_MOD_N == 1) \
@@ -906,7 +906,7 @@ PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
         &what_to_do).stream()
 
 #define SOME_KIND_OF_LOG_IF_EVERY_N(severity, condition, n, what_to_do) \
-  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  thread_local int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
   ++LOG_OCCURRENCES; \
   if (condition && \
       ((LOG_OCCURRENCES_MOD_N=(LOG_OCCURRENCES_MOD_N + 1) % n) == (1 % n))) \
@@ -915,7 +915,7 @@ PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
                  &what_to_do).stream()
 
 #define SOME_KIND_OF_PLOG_EVERY_N(severity, n, what_to_do) \
-  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  thread_local int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
   ++LOG_OCCURRENCES; \
   if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
   if (LOG_OCCURRENCES_MOD_N == 1) \
@@ -924,7 +924,7 @@ PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
         &what_to_do).stream()
 
 #define SOME_KIND_OF_LOG_FIRST_N(severity, n, what_to_do) \
-  static int LOG_OCCURRENCES = 0; \
+  thread_local int LOG_OCCURRENCES = 0; \
   if (LOG_OCCURRENCES <= n) \
     ++LOG_OCCURRENCES; \
   if (LOG_OCCURRENCES <= n) \